Electric water heater



Hal

INVENTOR PETER A.JOHNSON FIG. IY

A TTORNE Y Oct. 4, 1932. P. A. JOHNSON ELECTRIC WATER HEATER Filed April 5. 1950 FIG. III

Patented Oct. 4,' 1932 PATEN osrica PETER A. JOHNSON, F PORTLAND, OREGON ELECTRIC WATER HEATER Application filed April 3, 1930. Serial No. 441,223.

This invention relates generally to devices .for heating water, and particularly to those employing electrical heating elements.

The main object of this invention is to provide an electrically operated hot water heater which is simple in design, easy to construct and quick and efficient in operation.

The second object is to provide an electric heater of the type employing thermal circulation and to so construct same that the rate of circulation will be increased as, much as possible.

These, and other objects, will become more apparent from the specification following as illustrated in the accompanying drawing, in which I Figure I is a vertical section through the device.

Figure II is a side elevation of same showing a modification in the manner of connecting same to a boiler.

Fi re III is an enlarged section along the llne 3 -3 in Fig. I.

Figure IV is a horizontal section along the line 4-4 in Fig. I.

Figure V is a section through a modified form of riser outlet.

Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to the drawing, there is shown an ordinary domestic hot water tank 1 with standard connections including aicold water supply pipe 2, a hot water outlet pipe 3 and aside outlet connection 1.

' Turning now to the heater it will be seen to consist of a dome shaped steel shell 5 provided with a flanged circular bottom 6 upon which is mounted a curved battle 7. On top of the shell 5 are formed thethreaded connections 8 and 8-A which are concentric. On the side ofthe shell 5 is a threaded connection 9. Under the bottom 6 of the heater is mounted a heating element 10 to which'cur- .rent is supplied through the electrical connection 11. The heater 10 is supported in position by means of a ring 12 or other suitable fastening. It is desirable to cover the under side of the element 10 with insulation.

In fact, it is desirable to cover the entire heater shell 5, as well as the tank 1 and. its connections, in order to conserve the heat.

The connection 4 is joined to the connection 9 by means of a circulating pipe 13. Joined to the connection 8A is a riser pipe 14. Surrounding the riser 14 and spaced therefrom is a cover pipe 15 whose lower end is threaded into a nipple 16 whose ends are threaded into the bottom of the tank 1 and into the connection 8.

As thus described it is possible for water to occupy the space between the riser l4 and the cover pipe 15, but in some instances water is excluded from this space by welding the pipe 15 around the end of'the pipe 14, as shown in Fig. V. This, of course, provides a much better form of insulation for the riser pipe 14, and it is the insulation of this pipe which is responsible for the improved circulation of the heater, which not only 7 avoids the over-heating of the water in the shell 5 but also prolongs the life of the heating element 10. I

It is evident from the foregoing that the temperature of the water within the pipe 14 is practically uniform throughout its length due to the fact that the heat is unable to escape across the space between the pipes 14; and 15.

While this device has been illustrated as so an electrical heating appliance it must be evident that the improved form of riser 14: is usable in connection with any form of tank heater. It will also be seen-that by the'employment of the baffle 7 the. water will be deflected uniformly over the entire surface of the heating element 10, thereby exposing a larger amount of water to the heated surface.

I claim:

1. A water heater. consisting of a dome shaped shell having an outlet connection at the top thereof, an inlet connection near [the bottom thereof, a bottom for said shell,

a curved deflector mounted on said bottom in front of said inlet connection, a riser forming an outlet at the top of said shell, and apipe surrounding said riser and spaced therefrom for the purpose of retarding the fioW of heat through the walls of said riser.

. 2. A water heater consisting of a domeshaped shell having a fiat bottom above the lower edge thereof, a flat electric heating element placed against the under side of said bottom, an inlet pipe communicating with the interior of said shell near said bottom, a curved bafiie on said bottom adjacent to said inlet pipe, and an outlet pipe communicating with the uppermost portion of said shell.

3. A water heater consisting of a domeshaped shell having an outlet connection at the top thereof and having an inlet connection near the bottom thereof, a bottom for said shell, a curved deflector mounted on said bottom in front of said inlet connection, and a riser communicating With said outlet at the top of said shell.

4. In a hot water heater, the combination of a storage tank, a shell disposed under said storage tank in which Water may be heated, a riser communicating with said shell extending upwardly into said storage tank, and a cover pipe encircling said riser and spaced therefrom substantially the full height of the riser adapted to maintain an air space around said riser. 7

PETER A. JOHNSON. 

